What is the average number of stars an and diameter of a spiral galaxy?
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One of the largest known spiral galaxies is NGC 6872, which is 522,000 light-years across from the tips of its outstretched spiral arms — that's about 5 times the size of the Milky Way.
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One of the largest known spiral galaxies is NGC 6872, which is 522,000 light-years across from the tips of its outstretched spiral arms — that's about 5 times the size of the Milky Way.
The Milky Way is a barred spiral galaxy with a diameter between 150,000 and 200,000 light-years (ly).
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